feat: add cert manager

cluster/base/infra/cert-manager.yaml

@@ -0,0 +1,18 @@
+---
+apiVersion: kustomize.toolkit.fluxcd.io/v1
+kind: Kustomization
+metadata:
+  name: infra-cert-manager
+  namespace: flux-system
+spec:
+  interval: 1h0m0s
+  path: ./infra/controllers/cert-manager
+  dependsOn:
+  - name: infra-namespaces
+  prune: true
+  retryInterval: 1m0s
+  sourceRef:
+    kind: GitRepository
+    name: flux-system
+  timeout: 5m0s
+  wait: true